Automatic governing device for electric pumps



LNo Model.)

F. A. POGOGK. AUTOMATIC GOVERNING DEVICE FOR ELECTRIC PUMPS. No.485,221.

Patented Nov. 1, 1892.7

WITHIN 1mm NT DR 0 u L 4-! U V g1 MINE! 15 AW" TM, MW

wn-wezssss Z;

Uwrrnn STATES PATENT O FICE,

FRANCIS A. POOOOK, OF LYNN, MASSACHUSETTS, ASSIGNOR TO THE THOMSON VANDEPOELE ELEOTRIO MINING COMPANY, OF MAINE.

AUTOMATIC GOVERNING DEVICE FOR ELECTRIC PUMPS.

SPECIFICATION forming part of Letters Patent No. 485,221, dated November1, 1892.

Application filed March 20, 1891.

To all whom it may concern.-

Be it known that I, FRANCIS A. PooooK, a citizen of Great Britain,residing at Lynn, in the county of Essex and State of Massachusetts,haveinventeda certain new and useful Improvement in Automatic GoverningDevices for Electric Pumps, of which the following is a specification.

Reference is made to the accompanying I0 drawings, in which- Figure 1 isa side elevation, and Fig. 2 a plan, of my device.

My invention consists of a device for automatically stopping andstarting an electric pump according to the level of the water or otherliquid to be elevated. It is especially adapted for mining operations,where it is desired that the pump shall be automatically started whenthe water has reached a certain level and stopped when a certain lowerlevel has been reached.

In general the device consists, first, of a float of such a size thatwhen it has been immersed a certain distance it will tend to rise withsufficient force to operate a rack and pinion or similar intermediatedevice engaging with the controlling resistance of the motor;'second, intwo smaller floats, one for the high level and the other for the lowlevel,

between which the water may be allowed to accumulate and which areconnected, respectively, to stops, which hold the operating device forthe resistance in its two extreme positions, so that the motor may befully stopped or fully started, according as the water may be at its lowor at its high level.

Referring to the drawings, A represents a base-plate adapted to besecured in anysuitable manner against the side wall of a mine 40 orother place where water or other liquid accumulates. Pivoted to thisbase-plate is a pulley B and a concentric gear-wheel O.

D is a rack moving vertically on frictionrollers E and engaging withgear-wheel O.

On the lower end of rack D is afloat F. This float is of such a sizethat when the waterhas risen to a definite level above it it will, onbeing released, rise with sufficient force to drive gear-wheel O andpulley B, the latter being belted by the chain or cord G to a resistanceSerial No. 385,734. (No model.)

Q or other controlling devices for an electrically-driven pump orothermechanism,(shown conventionally at T.)

H and K are two smaller floats placed at points at high and low water,respectively, and connected each to a pawl, the two pawls L andMengaging oppositely with gear-wheelO. When both pawls are in engagementwith'the gear-wheel, it is held immovable; but it will be free to movein one direction or the other as one pawl or the other is lifted fromengagem ent with it. Thus when pawl L is lifted it will be free to .moveonly in the direction of the large arrow; but when the pawl M is liftedit will be free to move only in the di rection of the small arrow.

The operation of the devices is as follows: Assuming that the water isat its lowest level with the pump out of action and the parts in thecondition shown by the drawings, the wa- 7o ter will then graduallyaccumulate, tending to lift the floats E- and K. The former float,however, cannot rise because pawl M is in engagement with the gear-wheeland prevents its turning under the pressure of the float F. WVhen,however, the water reaches its highest level near the float H, thelatter will be lifted and thereby throw pawl M out of engagement withthe gear-wheel. This will permit the large float F to rise withconsiderable force and operate the resistance, thereby starting thepump. As the pump continues to work the level of the water will fall;but the float F cannot fall with it, because gearwheel O is locked bythe pawl L. When, 8 5 however, the water reaches its lower level, belowthe float K, the latter drops and lifts the pawl L out of engagementwith the gearwheel and permits float F to drop by its own weight,thereby again operating the resist- 9o ance to stop the electric pump.These operations are continued automatically from time to time, the pumpcoininginto operation when the water reaches its highest level and beingthrown outof engagement when it reachesits lower level. The lower partof the gear-wheel O runs in a receptacle 0, containing oil or otherlubricating material, and stops P and R are provided for float K,between which limit it is free to move from time to time.

What I claim as new, and desire to secure by Letters Patent, is-

1. The combination of an electric pump or other mechanism with astarting and stepping" mechanisru therefor and afloat connected with andserving as a motor to operate said mechanism, and controlling mechanismtherefor, holding the float against movement until the liquid hasreached predetermined higher and lower levels, at which, respectively,it is desired to have the mechanism stopped and started.

2. The combination, with an electric pump or similar mechanism, of astarting and stopping device therefor, a float connected with andserving to operate said starting and stopping mechanism, and lockingdevices controlled by a rising" and falling liquid at a determined highand low level, respectively.

3. The combination, with an electric pump or similar mechanism, of ing"devices therefor, an actuating-float, high and low level floats, andlocking devices controlled thereby to hold the actuating-float at itshigh or low position, respectively.

4. An automatic controlling device for an electric pump or similarmechanism, consisting of a Wheel and an 0pe1'ating-tloat therefor, aconnection from said Wheel to the resistance or other motor-regulatingdevice, a lock for the said lloat at its upper and lower levels,respectively, and high and low Water floats connected with the saidlock.

In testimony whereof I have hereto set my hand this 10th day of March,1891.

FRANCIS A. IOCOOK.

stopping and startitnesses:

l lnwann iii. BENTLEY, ARTHUR l. KNKn-Itr.

